Subject: [Healeys] Overdrive pressure

From: Simon Lachlan via Healeys <[email-masked]>
Date: Mon, 2 Aug 2021 21:17:54 +0100

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David, Hank...thank you for help and advice. Hank you were just about on the
money.

You'll recall that my OD was slipping in & out at low revs? Of course you
do.

I bought a gauge from ODSpares, excellent people/very helpful. (In
retrospect, I wonder how I've managed for so long without one).

Pressure showed as well into the 470 to 490 range whilst OD was engaged at
+/- 1,500 rpm in 4th. Which is GOOD.

But, pressure dropped to zero immediately upon disengaging and switching
off. Which is BAD.

The little hole in the so-called "Valve operating" was/is clear.

I phoned Dave Twigger at ODSpares who said that there was debris under the
ball on the seat there OR, if it was clear, then the ball needed reseating.

So, I gave the ball a few brisk taps and the pressure drop did slow a little
up on the next gauge test.

I gave it some more taps and it improved somewhat again. Now takes about 30
seconds to get down to, say, 20psi and then loses pressure quite slowly.

So:-

1.	How hard can one "Tap" the ball? Not the easiest question to answer,
I do appreciate that. One man's tap is another man's wallop?

I suspect I'll have to repeat the process..

2.	What time duration is acceptable in operating terms for the pressure
drop? What am I aiming at?

Thanks, Simon

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link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal>David, Hank&#8230;..thank you for help and advice. =
Hank you were just about on the money.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>You&#8217;ll =
recall that my OD was slipping in &amp; out at low revs? Of course you =
do.<o:p></o:p></p><p class=3DMsoNormal>I bought a gauge from ODSpares, =
excellent people/very helpful. (In retrospect, I wonder how I&#8217;ve =
managed for so long without one).<o:p></o:p></p><p =
class=3DMsoNormal>Pressure showed as well into the 470 to 490 range =
whilst OD was engaged at +/- 1,500 rpm in 4<sup>th</sup>. Which is =
GOOD.<o:p></o:p></p><p class=3DMsoNormal>But, pressure dropped to zero =
immediately upon disengaging and switching off. Which is =
BAD.<o:p></o:p></p><p class=3DMsoNormal>The little hole in the so-called =
&#8220;Valve operating&#8221; was/is clear.<o:p></o:p></p><p =
class=3DMsoNormal>I phoned Dave Twigger at ODSpares who said that there =
was debris under the ball on the seat there OR, if it was clear, then =
the ball needed reseating.<o:p></o:p></p><p class=3DMsoNormal>So, I gave =
the ball a few brisk taps and the pressure drop did slow a little up on =
the next gauge test.<o:p></o:p></p><p class=3DMsoNormal>I gave it some =
more taps and it improved somewhat again. Now takes about 30 seconds to =
get down to, say, 20psi and then loses pressure quite =
slowly.<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>So:-<o:p></o:p></p><ol style=3D'margin-top:0cm' =
start=3D1 type=3D1><li class=3DMsoListParagraph =
style=3D'margin-left:0cm;mso-list:l0 level1 lfo1'>How hard can one =
&#8220;Tap&#8221; the ball? Not the easiest question to answer, I do =
appreciate that. One man&#8217;s tap is another man&#8217;s =
wallop?<o:p></o:p></li></ol><p class=3DMsoListParagraph>I suspect =
I&#8217;ll have to repeat the process&#8230;&#8230;<o:p></o:p></p><ol =
style=3D'margin-top:0cm' start=3D2 type=3D1><li class=3DMsoListParagraph =
style=3D'margin-left:0cm;mso-list:l0 level1 lfo1'>What time duration is =
acceptable in operating terms for the pressure drop? What am I aiming =
at?<o:p></o:p></li></ol><p class=3DMsoNormal =
style=3D'margin-left:18.0pt'><o:p>&nbsp;</o:p></p><p class=3DMsoNormal =
style=3D'margin-left:18.0pt'>Thanks, =
Simon<o:p></o:p></p></div></body></html>
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From: Henry G Leach via Healeys <[email-masked]>
Date: Tue, 03 Aug 2021 17:21:38 +0000 yIp5xYa7mvmNIiKRXRIxuzjkMHLKkYNhFvrVW/nBQKQc1vwpJYqXtyxqgHTdgVF1YINFwIBqydziJmYZj642KZoJgNT1olIXUIdgXgH6Zc+N3X5zs4VusgY6

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Simon-glad you found the problem. That little valve is the whole=0Acontr=
ol of the pressure and release and dirt is the main offender. =0AWhat I=
 see on my gauge is pressure over 400-450, then when OD is off.=0Aa stea=
dy bleed down to 300, 200, 100 then in a couple of minutes, or=0Asometim=
es a bit longer, goes to 0. Its a "slow bleed". Fades as the=0Aoil flows=
 down thru the valve and that tiny hole. Enlarging it will=0Amake the bl=
eed faster and the plugging up with debris harder to=0Aachieve. They rec=
ommend a 1MM hole if I remember the readings=0Acorrectly, but its a smal=
l drilling to allow oil to pass smoothly to=0Athe sump. This is why you=
 don't want 90W gear oil-its to "thick" to=0Awork with the unit, and it=
 also foams up in the annulus. Good 30W (or=0A20-50) NON detergent oil i=
s best to keep this process working.=0A(detergents also foam)=0APossibly=
 a little oxidation or crud gets between the ball and the=0Aseat, and it=
 then needs a smack to reseat the fit. Small thing matter=0Ain this scen=
ario. We all need a smack, now and then, to get with the=0Aprogram. Rega=
rds, Hank=0A=0A=09-----------------------------------------From: "Simon=
 Lachlan via=0AHealeys" =0ATo: "Healeys"=0ACc: =0ASent: Monday August 2=
 2021 1:24:09PM=0ASubject: [Healeys] Overdrive pressure=0A=0A=09David, H=
ank=E2=80=A6..thank you for help and advice. Hank you were just=0Aabout=
 on the money. =0A=0A=09You=E2=80=99ll recall that my OD was slipping in=
 & out at low revs? Of=0Acourse you do. =0A=0A=09I bought a gauge from O=
DSpares, excellent people/very helpful. (In=0Aretrospect, I wonder how I=
=E2=80=99ve managed for so long without one). =0A=0A=09Pressure showed a=
s well into the 470 to 490 range whilst OD was=0Aengaged at +/- 1,500 rp=
m in 4th. Which is GOOD. =0A=0A=09But, pressure dropped to zero immediat=
ely upon disengaging and=0Aswitching off. Which is BAD. =0A=0A=09The lit=
tle hole in the so-called =E2=80=9CValve operating=E2=80=9D was/is clear=
. =0A=0A=09I phoned Dave Twigger at ODSpares who said that there was deb=
ris=0Aunder the ball on the seat there OR, if it was clear, then the bal=
l=0Aneeded reseating. =0A=0A=09So, I gave the ball a few brisk taps and=
 the pressure drop did slow a=0Alittle up on the next gauge test. =0A=0A=
=09I gave it some more taps and it improved somewhat again. Now takes=0A=
about 30 seconds to get down to, say, 20psi and then loses pressure=0Aqu=
ite slowly. =0A=0A=09So:- =0A=0A=09* How hard can one =E2=80=9CTap=E2=80=
=9D the ball? Not the easiest question to=0Aanswer, I do appreciate that=
. One man=E2=80=99s tap is another man=E2=80=99s=0Awallop?=0A=0A=09I sus=
pect I=E2=80=99ll have to repeat the process=E2=80=A6=E2=80=A6 =0A=0A=09=
* What time duration is acceptable in operating terms for the=0Apressure=
 drop? What am I aiming at?=0A=0A=09Thanks, Simon

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<html><body>Simon-glad you found the problem. That little valve is the w=
hole control of the pressure and release and dirt is the main offender.&=
nbsp;&nbsp;<div><br></div><div>What I see on my gauge is pressure over 4=
00-450, then when OD&nbsp; is off. a steady bleed down to 300, 200, 100=
 then in a couple of minutes, or sometimes a bit longer, goes to 0. Its=
 a "slow bleed". Fades as the oil flows down thru the valve and that tin=
y hole. Enlarging it will make the bleed faster and the plugging up&nbsp=
; with debris harder to achieve. They recommend a 1MM hole if I remember=
 the readings correctly, but its a small drilling to allow oil to pass s=
moothly to the sump.&nbsp; This is why you don't want 90W gear oil-its t=
o "thick" to work with the unit, and it also foams up in the annulus. Go=
od 30W (or 20-50) NON detergent oil is best to keep this process working=
. (detergents also foam)</div><div><br></div><div>Possibly a little oxid=
ation or crud gets between the ball and the seat, and it then needs a sm=
ack to reseat the fit. Small thing matter in this scenario. We all need=
 a smack, now and then, to get with the program. Regards, Hank<br><br><d=
iv class=3D"reply-new-signature"></div><p>------------------------------=
-----------</p>From: "Simon Lachlan via Healeys" <[email-masked]=
><br>To: "Healeys"<br>Cc: <br>Sent: Monday August 2 2021 1:24:09PM<br>Su=
bject: [Healeys] Overdrive pressure<br><br>=0A<div class=3D"WordSection1=
">=0A<p class=3D"MsoNormal">David, Hank=E2=80=A6..thank you for help and=
 advice.=0AHank you were just about on the money.</p>=0A<p class=3D"MsoN=
ormal">&nbsp;</p>=0A<p class=3D"MsoNormal">You=E2=80=99ll recall that my=
 OD was slipping in &amp; out=0Aat low revs? Of course you do.</p>=0A<p=
 class=3D"MsoNormal">I bought a gauge from ODSpares, excellent=0Apeople/=
very helpful. (In retrospect, I wonder how I=E2=80=99ve managed for=0Aso=
 long without one).</p>=0A<p class=3D"MsoNormal">Pressure showed as well=
 into the 470 to 490=0Arange whilst OD was engaged at +/- 1,500 rpm in 4=
<sup>th</sup>.=0AWhich is GOOD.</p>=0A<p class=3D"MsoNormal">But, pressu=
re dropped to zero immediately upon=0Adisengaging and switching off. Whi=
ch is BAD.</p>=0A<p class=3D"MsoNormal">The little hole in the so-called=
 =E2=80=9CValve=0Aoperating=E2=80=9D was/is clear.</p>=0A<p class=3D"Mso=
Normal">I phoned Dave Twigger at ODSpares who said=0Athat there was debr=
is under the ball on the seat there OR, if it=0Awas clear, then the ball=
 needed reseating.</p>=0A<p class=3D"MsoNormal">So, I gave the ball a fe=
w brisk taps and the=0Apressure drop did slow a little up on the next ga=
uge test.</p>=0A<p class=3D"MsoNormal">I gave it some more taps and it i=
mproved=0Asomewhat again. Now takes about 30 seconds to get down to, say=
,=0A20psi and then loses pressure quite slowly.</p>=0A<p class=3D"MsoNor=
mal">&nbsp;</p>=0A<p class=3D"MsoNormal">So:-</p>=0A<ol style=3D"margin-=
top:0cm;" start=3D"1" type=3D"1"><li class=3D"MsoListParagraph" style=3D=
"margin-left:0cm;">How hard can one =E2=80=9CTap=E2=80=9D=0Athe ball? No=
t the easiest question to answer, I do appreciate that.=0AOne man=E2=80=
=99s tap is another man=E2=80=99s wallop?</li>=0A</ol><p class=3D"MsoLis=
tParagraph">I suspect I=E2=80=99ll have to repeat the=0Aprocess=E2=80=A6=
=E2=80=A6</p>=0A<ol style=3D"margin-top:0cm;" start=3D"2" type=3D"1"><li=
 class=3D"MsoListParagraph" style=3D"margin-left:0cm;">What time duratio=
n is=0Aacceptable in operating terms for the pressure drop? What am I=0A=
aiming at?</li>=0A</ol><p class=3D"MsoNormal" style=3D"margin-left:18pt;=
">&nbsp;</p>=0A<p class=3D"MsoNormal" style=3D"margin-left:18pt;">Thanks=
, Simon</p>=0A</div>=0A</[email-masked]></div></body></html>

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[email-masked]

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From: Henry G Leach via Healeys <[email-masked]>
Date: Wed, 04 Aug 2021 17:42:17 +0000 JylhIAJEw3rxlnicqSaZA2sIwOvfkarBBp23UXJIpJ/k3CfSV+PO9lO5lwnCZhVpNlOVQYRw+VQN3TMKX0MjV3lV6v1EQhnxOrQ3I8qlDjExaS7JtWdft3Zp

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Simon-I did all of my test readings on the bench-transmission out of=0At=
he car. I use an electric drill, in reverse, to drive the yoke and=0Aobt=
ain the readings.=0AWhat you describe is a pressure issue in the accumul=
ator. The car will=0Anot shift into OD with low pressure. It needs that=
 high number to=0Aovercome the 8 springs which keep the cone clutch to t=
he rear position=0A(direct drive). Then as the pump builds up pressure,=
 it is available=0Awhen you flip the switch allowing the ball to seat in=
 the=0Avalve.(providing that is seating properly-not bleeding down) That=
 high=0Apressure drives the two horizontal pistons forward, pushing agai=
nst,=0Aand compressing, the 8 springs and allowing the cone clutch to no=
w run=0Ato the front position, rotating the annulus and sun gear, thus=
=0Aeffecting OD. =0AYou do not have enough pressure to do that. The hot=
 oil suggests lower=0Aviscosity, and loss of sealing of the O-rings and=
 piston rings. So=0Ayes, I also think you are looking at a tear down and=
 rebuild of the=0Aaccumulator and oil pump parts. =0AContact David at OD=
 Spares and see if he concurs and order the=0Anecessary parts...sounds l=
ike its time for that. It would be nice to=0Ahave that tunnel back in po=
sition and all working normal. Hank =0A=0A=09---------------------------=
--------------From:=[email-masked]=0ATo: gradea1@ch=
arter.net=0ACc: =0ASent: Wednesday August 4 2021 1:35:48AM=0ASubject: [H=
ealeys] Overdrive pressure=0A=0A=09Hank, =0A=0A=09Thank you for that.=
 =0A=0A=09Actually, it=E2=80=99s all gone pear-shaped! =0A=0A=09I discus=
sed the OD pressure with Dave at ODSpares=E2=80=A6..how high the=0Apress=
ure went at 1500rpm with and without OD engaged and how long it=0Atook f=
or pressure to drop to zero. He said that re-seating the ball=0Ahad fixe=
d it. =0A=0A=09I took it out for a run down a local motorway and some co=
untry roads.=0A10 miles+/-. On the way to this particular pub- surprise=
 =E2=80=93 the OD=0Abehaved well, better than for a while. Popped in and=
 out very briskly.=0A=0A=0A=09I only stayed for 20 minutes or so at the=
 pub, by which time there=0Amust have been a fair old heat transfer from=
 gearbox and engine. It=0Adid worse and worse on the way back. Pressure=
 at 250psi in higher revs=0Aand practically 0 at low revs. Paradoxically=
 would click into OD=0Anicely but was back to slipping in/out at low rev=
s. =0A=0A=09I=E2=80=99m feeling my inner Basil Fawlty coning on. I=E2=80=
=99ll have to strip=0Ait down after all. =0A=0A=09(It=E2=80=99s a strang=
e feeling=E2=80=A6..sitting in the cab with the wheels off=0Athe ground=
 and letting out the clutch. Kept expecting the car to surge=0Athrough t=
he workshop wall. Driving down the motorway without the=0Atunnel cover f=
eels strange too. I do, so far, still have my left hand.=0AI do occasion=
ally drive with left hand resting on tunnel cover. Not=0Ayesterday!) =0A=
=0A=09Any ideas would be appreciated, =0A=0A=09Simon =0A=0A=09FROM: grad=
[email-masked] =0ASENT: 03 August 2021 18:22=0ATO: 'simon.lachlan@alexa=
revel.plus.com' =0ACC: 'Healeys' =0ASUBJECT: RE: [Healeys] Overdrive pre=
ssure   =0A=0A=09Simon-glad you found the problem. That little valve is=
 the whole=0Acontrol of the pressure and release and dirt is the main of=
fender.   =0A=0A=09What I see on my gauge is pressure over 400-450, then=
 when OD is off.=0Aa steady bleed down to 300, 200, 100 then in a couple=
 of minutes, or=0Asometimes a bit longer, goes to 0. Its a "slow bleed".=
 Fades as the=0Aoil flows down thru the valve and that tiny hole. Enlarg=
ing it will=0Amake the bleed faster and the plugging up with debris hard=
er to=0Aachieve. They recommend a 1MM hole if I remember the readings=0A=
correctly, but its a small drilling to allow oil to pass smoothly to=0At=
he sump. This is why you don't want 90W gear oil-its to "thick" to=0Awor=
k with the unit, and it also foams up in the annulus. Good 30W (or=0A20-=
50) NON detergent oil is best to keep this process working.=0A(detergent=
s also foam)   =0A=0A=09Possibly a little oxidation or crud gets between=
 the ball and the=0Aseat, and it then needs a smack to reseat the fit. S=
mall thing matter=0Ain this scenario. We all need a smack, now and then,=
 to get with the=0Aprogram. Regards, Hank =0A=0A=09---------------------=
-------------------- =0A=0A=09From: "Simon Lachlan via Healeys"=0A To: "=
Healeys"=0A Cc:=0A Sent: Monday August 2 2021 1:24:09PM=0A Subject: [Hea=
leys] Overdrive pressure  =0A=0A=09David, Hank=E2=80=A6..thank you for h=
elp and advice. Hank you were just=0Aabout on the money. =0A=0A=09You=E2=
=80=99ll recall that my OD was slipping in & out at low revs? Of=0Acours=
e you do. =0A=0A=09I bought a gauge from ODSpares, excellent people/very=
 helpful. (In=0Aretrospect, I wonder how I=E2=80=99ve managed for so lon=
g without one). =0A=0A=09Pressure showed as well into the 470 to 490 ran=
ge whilst OD was=0Aengaged at +/- 1,500 rpm in 4th. Which is GOOD. =0A=
=0A=09But, pressure dropped to zero immediately upon disengaging and=0As=
witching off. Which is BAD. =0A=0A=09The little hole in the so-called=
 =E2=80=9CValve operating=E2=80=9D was/is clear. =0A=0A=09I phoned Dave=
 Twigger at ODSpares who said that there was debris=0Aunder the ball on=
 the seat there OR, if it was clear, then the ball=0Aneeded reseating.=
 =0A=0A=09So, I gave the ball a few brisk taps and the pressure drop did=
 slow a=0Alittle up on the next gauge test. =0A=0A=09I gave it some more=
 taps and it improved somewhat again. Now takes=0Aabout 30 seconds to ge=
t down to, say, 20psi and then loses pressure=0Aquite slowly. =0A=0A=09S=
o:- =0A=0A=09* How hard can one =E2=80=9CTap=E2=80=9D the ball? Not the=
 easiest question to=0Aanswer, I do appreciate that. One man=E2=80=99s t=
ap is another man=E2=80=99s=0Awallop?=0A=0A=09I suspect I=E2=80=99ll hav=
e to repeat the process=E2=80=A6=E2=80=A6 =0A=0A=09* What time duration=
 is acceptable in operating terms for the=0Apressure drop? What am I aim=
ing at?=0A=0A=09 Thanks, Simon

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<html><body>Simon-I did all of my test readings on the bench-transmissio=
n out of the car.&nbsp; I use an electric drill, in reverse, to drive th=
e yoke and obtain the readings.<div><br></div><div>What you describe is=
 a pressure issue in the accumulator. The car will not shift into OD wit=
h low pressure.&nbsp; It needs that high number to overcome the 8 spring=
s which keep the cone clutch to the rear position (direct drive).&nbsp;=
 Then as the pump builds up pressure, it is available when you flip the=
 switch allowing the ball to seat in the valve.(providing that is seatin=
g properly-not bleeding down) That high pressure drives the two horizont=
al pistons forward, pushing against, and compressing, the 8 springs and=
 allowing the cone clutch to now run to the front position, rotating the=
 annulus and sun gear, thus effecting OD.&nbsp;&nbsp;</div><div><br></di=
v><div>You do not have enough pressure to do that.&nbsp; The hot oil sug=
gests lower viscosity, and loss of sealing of the O-rings and piston rin=
gs.&nbsp; So yes, I also think you are looking at a tear down and rebuil=
d of the accumulator and oil pump parts.&nbsp;&nbsp;</div><div><br></div=
><div>Contact David at OD Spares and see if he concurs and order the nec=
essary parts...sounds like its time for that. It would be nice to have t=
hat tunnel back in position and all working normal. Hank&nbsp;<br><br><d=
iv class=3D"reply-new-signature"></div><p>------------------------------=
-----------</p>From: [email-masked]<br>To: gradea1@ch=
arter.net<br>Cc: <br>Sent: Wednesday August 4 2021 1:35:48AM<br>Subject:=
 [Healeys] Overdrive pressure<br><br>=0A<div class=3D"WordSection1">=0A<=
p class=3D"MsoNormal"><span>Hank,</span></p>=0A<p class=3D"MsoNormal"><s=
pan>Thank=0Ayou for that.</span></p>=0A<p class=3D"MsoNormal"><span>Actu=
ally, it=E2=80=99s all gone=0Apear-shaped!</span></p>=0A<p class=3D"MsoN=
ormal"><span>I=0Adiscussed the OD pressure with Dave at ODSpares=E2=80=
=A6..how high the=0Apressure went at 1500rpm with and without OD engaged=
 and how long=0Ait took for pressure to drop to zero. He said that re-se=
ating the=0Aball had fixed it.</span></p>=0A<p class=3D"MsoNormal"><span=
>I=0Atook it out for a run down a local motorway and some country roads.=
=0A10 miles+/-. On the way to this particular pub- surprise =E2=80=93 th=
e OD=0Abehaved well, better than for a while. Popped in and out very=0Ab=
riskly.</span></p>=0A<p class=3D"MsoNormal"><span>I=0Aonly stayed for 20=
 minutes or so at the pub, by which time there=0Amust have been a fair o=
ld heat transfer from gearbox and engine. It=0Adid worse and worse on th=
e way back. Pressure at 250psi in higher=0Arevs and practically 0 at low=
 revs. Paradoxically would click into=0AOD nicely but was back to slippi=
ng in/out at low revs.</span></p>=0A<p class=3D"MsoNormal"><span>I=E2=80=
=99m=0Afeeling my inner Basil Fawlty coning on. I=E2=80=99ll have to str=
ip it down=0Aafter all.</span></p>=0A<p class=3D"MsoNormal"><span>(It=E2=
=80=99s=0Aa strange feeling=E2=80=A6..sitting &nbsp;in the cab with the=
 wheels off=0Athe ground and letting out the clutch. Kept expecting the=
 car to=0Asurge through the workshop wall. Driving down the motorway wit=
hout=0Athe tunnel cover feels strange too. I do, so far, still have my=
=0Aleft hand. I do occasionally drive with left hand resting on tunnel=
=0Acover. Not yesterday!)</span></p>=0A<p class=3D"MsoNormal"><span>Any=
=0Aideas would be appreciated,</span></p>=0A<p class=3D"MsoNormal"><span=
>Simon</span></p>=0A<p class=3D"MsoNormal"><span>&nbsp;</span></p>=0A<di=
v>=0A<div style=3D"border:none;border-top:solid #E1E1E1 1pt;padding:3pt=
 0cm 0cm 0cm;">=0A<p class=3D"MsoNormal"><b><span lang=3D"en-us">From:</=
span></b>=0A<span lang=3D"en-us">[email-masked]=0A&lt;gradea1@chart=
er.net&gt;<br><b>Sent:</b> 03 August 2021 18:22<br><b>To:</b> 'simon.lac=
[email-masked]'=0A&lt;[email-masked]&gt;<br=
><b>Cc:</b> 'Healeys' &lt;[email-masked]&gt;<br><b>Subject:</b>=
 RE: [Healeys] Overdrive pressure</span></p>=0A</div>=0A</div>=0A<p clas=
s=3D"MsoNormal">&nbsp;</p>=0A<p class=3D"MsoNormal">Simon-glad you found=
 the problem. That little=0Avalve is the whole control of the pressure a=
nd release and dirt is=0Athe main offender.&nbsp;&nbsp;</p>=0A<div>=0A<p=
 class=3D"MsoNormal">&nbsp;</p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal=
">What I see on my gauge is pressure over=0A400-450, then when OD&nbsp;=
 is off. a steady bleed down to 300,=0A200, 100 then in a couple of minu=
tes, or sometimes a bit longer,=0Agoes to 0. Its a "slow bleed". Fades a=
s the oil flows down thru the=0Avalve and that tiny hole. Enlarging it w=
ill make the bleed faster=0Aand the plugging up&nbsp; with debris harder=
 to achieve. They=0Arecommend a 1MM hole if I remember the readings corr=
ectly, but its=0Aa small drilling to allow oil to pass smoothly to the s=
ump.&nbsp;=0AThis is why you don't want 90W gear oil-its to "thick" to w=
ork with=0Athe unit, and it also foams up in the annulus. Good 30W (or 2=
0-50)=0ANON detergent oil is best to keep this process working. (deterge=
nts=0Aalso foam)</p>=0A</div>=0A<div>=0A<p class=3D"MsoNormal">&nbsp;</p=
>=0A</div>=0A<div>=0A<p class=3D"MsoNormal" style=3D"margin-bottom:12pt;=
">Possibly a little=0Aoxidation or crud gets between the ball and the se=
at, and it then=0Aneeds a smack to reseat the fit. Small thing matter in=
 this=0Ascenario. We all need a smack, now and then, to get with the=0Ap=
rogram. Regards, Hank</p>=0A<p>-----------------------------------------=
</p>=0A<p class=3D"MsoNormal" style=3D"margin-bottom:12pt;">From: "Simon=
=0ALachlan via Healeys"<br>=0ATo: "Healeys"<br>=0ACc:<br>=0ASent: Monday=
 August 2 2021 1:24:09PM<br>=0ASubject: [Healeys] Overdrive pressure</p>=
=0A<div>=0A<p class=3D"MsoNormal">David,=0AHank=E2=80=A6..thank you for=
 help and advice. Hank you were just about on=0Athe money.</p>=0A<p clas=
s=3D"MsoNormal">&nbsp;</p>=0A<p class=3D"MsoNormal">You=E2=80=99ll recal=
l=0Athat my OD was slipping in &amp; out at low revs? Of course you do.<=
/p>=0A<p class=3D"MsoNormal">I bought a=0Agauge from ODSpares, excellent=
 people/very helpful. (In retrospect,=0AI wonder how I=E2=80=99ve manage=
d for so long without one).</p>=0A<p class=3D"MsoNormal">Pressure=0Ashow=
ed as well into the 470 to 490 range whilst OD was engaged at=0A+/- 1,50=
0 rpm in 4<sup>th</sup>. Which is GOOD.</p>=0A<p class=3D"MsoNormal">But=
, pressure=0Adropped to zero immediately upon disengaging and switching=
 off.=0AWhich is BAD.</p>=0A<p class=3D"MsoNormal">The little=0Ahole in=
 the so-called =E2=80=9CValve operating=E2=80=9D was/is clear.</p>=0A<p=
 class=3D"MsoNormal">I phoned Dave=0ATwigger at ODSpares who said that t=
here was debris under the ball=0Aon the seat there OR, if it was clear,=
 then the ball needed=0Areseating.</p>=0A<p class=3D"MsoNormal">So, I ga=
ve the=0Aball a few brisk taps and the pressure drop did slow a little u=
p on=0Athe next gauge test.</p>=0A<p class=3D"MsoNormal">I gave it some=
=0Amore taps and it improved somewhat again. Now takes about 30=0Asecond=
s to get down to, say, 20psi and then loses pressure quite=0Aslowly.</p>=
=0A<p class=3D"MsoNormal">&nbsp;</p>=0A<p class=3D"MsoNormal">So:-</p>=
=0A<ol start=3D"1" type=3D"1"><li class=3D"MsoListParagraph">How=0Ahard=
 can one =E2=80=9CTap=E2=80=9D the ball? Not the easiest question to ans=
wer, I=0Ado appreciate that. One man=E2=80=99s tap is another man=E2=80=
=99s wallop?</li>=0A</ol><p class=3D"MsoListParagraph">I suspect I=E2=80=
=99ll have to repeat the=0Aprocess=E2=80=A6=E2=80=A6</p>=0A<ol start=3D"=
2" type=3D"1"><li class=3D"MsoListParagraph">What=0Atime duration is acc=
eptable in operating terms for the pressure=0Adrop? What am I aiming at?=
</li>=0A</ol><p class=3D"MsoNormal" style=3D"margin-left:18pt;">=0A&nbsp=
;</p>=0A<p class=3D"MsoNormal" style=3D"margin-left:18pt;">=0AThanks, Si=
mon</p>=0A</div>=0A</div>=0A</div>=0A</div></body></html>

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[email-masked]

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